Improve usage message for pgindent.

src/tools/pgindent/pgindent

 #!/bin/sh
 
-# $PostgreSQL: pgsql/src/tools/pgindent/pgindent,v 1.97 2007/12/21 14:20:36 momjian Exp $
+# $PostgreSQL: pgsql/src/tools/pgindent/pgindent,v 1.98 2008/01/16 20:13:44 momjian Exp $
 
 # Known bugs:
 #
@@ -9,7 +9,7 @@
 #	y = (int) x *y;
 
 if [ "$#" -lt 2 ]
-then	echo "Usage:  $0 typedefs file [...]" 1>&2
+then	echo "Usage:  `basename $0` typedefs file [...]" 1>&2
 	exit 1
 fi